RIVERSIDE, Calif. — Seven people were shot and wounded early Monday during a Halloween party at a Southern California nightclub, police said.

The shooting was reported at a nightclub called Sevilla in the city of Riverside that had promoted a weekend of Halloween-themed events, including a Sunday night rap show billed as “The First Purge” or “The Purge Election Year.”

Two victims found by officers inside the nightclub were taken to a hospital for treatment. Five other victims later arrived at local hospitals with gunshot wounds, police said.